Commutator.



Patented Dec. l8, I900.

m 0 9 n 1 E 5 0 m A F W Eu A I n K n .wm F m M No. 01mm.

(No Model.)

UNITED STATES PATENT OFFICE.

FRITZ KAEFERLE, OF HANOVER, GERMANY.

COMMUTATOR.

SPECIFICATION forming part of Letters Patent No. 664,219, dated December18, 1900.

Application filed September 15, 1900. Serial No, 30,149. (No model.)

To all whom it may concern.

Be itknown that I, FRITZ KAEFERLE, a subject ofthe Emperor ofGermany,and a resident of Hanover, in the Empire of Germany, haveinvented a new and useful Improvement in Oommutators for ElectricMachines, Dynamos, &c., of which the following is a specification.

Myinvention relates to a new and improved collector for electricmachines, dynam os, dad, and embraces certain novel advantageshereinainfter set forth and described.

In the accompanying drawings, in which similar letters of referencerefer to similar parts, Figure 1 is a sectional elevation of a deviceembracing my invention. Fig. 2 is an end view thereof. Fig. 3 is asectional view of a slight modification.

In the construction of my invention I employ an axle a, on whichdisks 1) and c are mounted. The former is tightly secured to the saidaxle and the latter (disk 0) while snugly fitting on the same can bemoved backward and forward thereon. LIhe collector-body, formed of aplurality of lamellze h, with intervening insulated material t', isprovided on each side with annular rabbets or grooves g, in which ringsm and n, consisting of some good insulating material, snugly enter. Thisbody portion surrounds the axle Ct aforesaid in the known manner, butdoes not rest upon the said axle, an annular chamber being formed aroundthe same, thus allowing for the contraction and expansion of the bodyunder influence of changing temperatures without disturbing the form oreffectiveness of the'collector. The disks aforesaid are provided ontheir faces with projections which enter a V -shaped annular groove orslot formed in rings cl and 6, each of which latter, as shown in thedrawings, is angular in crosssection and snugly fits within the saidrings on and n. The axle Ct is screw-threaded on its outer end andcarries a nut f, as shown.

In assembling the collector the disk I) is securely fastened on the axlea, the rings (1 and we placed in proper position, and the body slippedon. Disk 0 is next placed in position after rings 12 and 6, when bytightening nutf rings m and n are driven home in grooves 9,

rings (Z and 6 into rings m and n, and projections formed on said disksforced into their grooves and the entire collector rigidly and firmlybound together and in place on the axle with but the single adjustment.The said rings on and 72 may be formed as shown in cross-section in Fig.1, in which their outer edges are somewhat beveled, or may be formed asshown in Fig. 3, with the said edges perfectly angular. It will be thusseen that the body is so held that it cannot become looscued,contraction and expansion of the collector-body under varyingtemperatures being anticipated and their ill effects eliminated by theannular chamber formed about the axle, the form at all times maintained,the parts gripping one the other in their respective position, and allsecurely held together and also on the supporting-axle by the one means,as described.

Having nowdescribed my invention, what I claim as new, and desire toprotect by Letters Patent of the United States of America, is

1. In a commutator for electric machines the combination of an axle,disks mounted thereon and provided with projections on their innerfaces, a body portion provided with annular grooves, rings adapted toenter said grooves, other rings adapted to lie be tween said first ringsand said disk projections, and single means for tightening the saidparts and retaining them in theirproper position upon said axle,substantially as described.

2. In a commutator for electric machines the combination of a bodyportion provided with annular grooves, rings adapted to enter the same asecond set of rings engaging respectively each of said first rings andprovided with V-shaped annular slots, disks provided with projectionsand means for tightening said parts together and rigidly retaining themin position upon an engaging axle, substantially as described.

3. A new and improved commutator for electric machines, dynamos, &c.,having a body portion provided with annular grooves, a ring angular-1yU-shaped in cross-section adapted to enter said grooves, a second ringsnugly fitting in said first ring and provided In witness whereof I havehereunto set my hand in presence of two Witnesses.

FRITZ KAEFERLE.

Witnesses:

LEONORE KASOH, KIRKE LATHROP.

